This is the first complete novel in a new series by Jordan Hawk. You don't have to read the short prequel first, but I think it adds some world-building that would make this story clearer, and it adds to the pleasure of meeting the first couple again here, as we follow a new pair of MCs.
Tom Halloran is one of the few truly honest beat cops, in a quasi-historical New York where hex-magic is commonplace, sold on corners and in shops, used by everyone including the police. Tom's stellar ethics are a bit ironic, because he's hiding a secret illegal past life. But he was young at the time, and pulled in by family ties, and cut loose by disaster. In the aftermath, he's fashioned himself into the man he's always wanted to be. He's also hidden a rare magic talent, because he can't see any good use of it that wouldn't expose him.
Cicero is a cat-shifter familiar, who so far has not met the witch he was destined to bond with. As an unclaimed familiar, he's a tempting property for any witch looking to augment their powers. So far, the police department has protected him as one of their own, but his time to stay unbonded is running short. He'd have been thrilled, in his realization that Tom is his witch, if the man wasn't large, rough-hewn, ignorant, unlettered, probably bigoted, and everything a cat disdains. He's not sure whether being linked with Tom, as instinct demands, wouldn't be worse than some other random witch who would at least know what poetry was.
Two similar murder cases force these two men to work together. Cicero has to make a life-changing decision soon. Tom's past may be catching up with him, his safety may depend on a vain and oddly hostile familiar. And there's not much time for either of them to figure it out.
I enjoyed this story with imaginative world-building, some fun animal-shifter moments, and an exciting plot. I didn't connect with Cicero on an emotional level as much as I have other main characters by this author (including Tom) but he was very amusing to watch. I had a few issues with the magical worldbuilding and plot. When I set those aside, it was a fun, light-weight story with a lot of action, that made a fast, entertaining read.